From 4cc05543d48a35908b0756e133bd668745bd95c3 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Sun, 26 Jul 2026 13:23:46 +0200
Subject: kapi: implement device removal

---
 kapi/kapi/devices/device_registry.hpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

(limited to 'kapi')

diff --git a/kapi/kapi/devices/device_registry.hpp b/kapi/kapi/devices/device_registry.hpp
index 3952db66..a65bd4ad 100644
--- a/kapi/kapi/devices/device_registry.hpp
+++ b/kapi/kapi/devices/device_registry.hpp
@@ -18,12 +18,36 @@ namespace kapi::devices
   //! @addtogroup kapi-devices-kernel-defined
   //! @{
 
+  //! The interface for types interested in being notified about changes in the device registry.
+  struct device_registry_observer
+  {
+    //! Enable correct destruction through base pointers.
+    virtual ~device_registry_observer() = default;
+
+    //! Called after a device has been added to the registry.
+    //!
+    //! @param device The device that was added.
+    virtual auto on_device_added(kstd::shared_ptr<device> const & device) -> void = 0;
+
+    //! Called after a device has been removed from the registry.
+    //!
+    //! @param device The device that was remove.
+    virtual auto on_device_removed(device & device) -> void = 0;
+  };
+
+  //! @}
+
+  //! @addtogroup kapi-devices-kernel-defined
+  //! @{
+
   struct device_registry
   {
     device_registry() = default;
 
+    //! Initialize the global singleton registry instance.
     auto static init() -> void;
 
+    //! Get the global singleton registry instance.
     auto static get() -> device_registry &;
 
     //! Add a new device to the kernel's device registry.
@@ -49,8 +73,14 @@ namespace kapi::devices
     //! @return every device current reachable through the registry.
     [[nodiscard]] auto all() const -> kstd::vector<kstd::shared_ptr<device>>;
 
+    //! Subscribe to device registry notifications.
+    //!
+    //! @param observer The observer to notify.
+    auto subscribe(kstd::weak_ptr<device_registry_observer> observer) -> void;
+
   private:
     kstd::flat_map<kstd::string, kstd::weak_ptr<device>> m_devices{};
+    kstd::vector<kstd::weak_ptr<device_registry_observer>> m_observers{};
   };
 
   //! @}
-- 
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